Image quality will not be very impressive, but a zoom would work, yes.
But it will not keep focus while zooming.
And it will be rather long, possibly getting in the way of what you want to take a picture off.

If the bellows are non-automatic (i.e. do not convey aperture data to the metering electronics inside the camera) stop down metering should be good, yes.
But it depends a bit on the camera, and how it deals with a lack of input from the lens.